Ou un podcast pour ceux qui préfèrent ce format. Une plongée dans les abysses avec David Wahl et Jozée Sarrazin

www.radiofrance.fr/franceinter/...

Pour les francophones et une vue des écosystèmes profonds en général, une conférence grand public que j ai donnée en 2021 à l invitation de la Maison de la Mer a Lorient #oceanprofond #deepsea (~50 min + questions)

m.youtube.com/watch?v=DhwH...

Or www.nature.com/articles/s41...

More info:
www.nature.com/articles/d41...

So: the deep sea is one of our greatest ecological frontier. They belong to humanity. And #deepseamining could destroy it before we even know or understand it.. So let's be aware of the crucial fundamental stakes that are there. Let's not let them out of sight

Yet.. Oceans and the deep ocean are crucial for climate change, oxygen production, globally life on our planet.. We need them to breathe!

We have 7m x 7m maps of the entire moon, soon going down to 5m x 5m. This means than 1 pixel is a square of 7x7. Only 26% of the deep-seafloor has been mapped. The gap is expected to be filled by 2030, but for ~75% of it, the resolution will be 400 m x 400 m. So 80x less

seabed2030.org/our-mission/

And we are pretty ignorant of how it works: the biology, the biodiversity, the functioning,.. Probably just a few % of the species have been described

So these environment are very different from what we know, even "extreme" from a human perspective. However, the #deepsea is not "the deep sea" but a mosaic of ecosystems where life developed and even thrives, such as at hydrothermal vents. But those ecosystems are based on a different biology..

Temperature is cold (mean = 4°C), pressure very high. At sea surface, pressure is 1 bar. Every 10 m, one add another bar. So at 1000 m depth, the pressure is 100 bar, 100x more than the surface. For comparison: pressure at Mount Everest (8848 m) is 0.34 bar, just 3x less
#deepsea

#Deepocean = waters < 200-300 m depths, where sunlight is insufficient for net photosynthetic production to occur. Until 1000 m depth, it's the twilight zone, where some very very dim residual sunlight remains. Then, there is no sunlight at all. Hence, no alga

Required skills: R or Python or Matlab, molecular biology, statistics, English

#hydrothermal
#vents
#biologicalrhythms #physiology
#behavior
#lightpollution

Let´s hope and see whether the grass is greener on the other side of the fence, or if the sky is bluer on the other side of the cloud

Posting in English and / French thus. Hopefully in German at some point :) Would love that. Opinions are my own. Love science/sport/nature/art in many forms. But mostly post about science. And try to hopefully not feed to t-rolls

Or in French:
theconversation.com/horloges-bio...

And / or a broader audience article on biological rhythms in English
theconversation.com/biological-c...

The story behind the paper:
communities.springernature.com/posts/time-i...

Previous work for example:
- academic paper:
www.nature.com/articles/s41...